XML is a markup language and file format for storing, transmitting, and reconstructing arbitrary data.
Its name, XML, is an acronym for Extensible Markup Language.
Extensible: Unlike HTML, which has a predefined set of tags, XML allows you to define your own custom tags to describe your data. This makes it highly flexible for representing different kinds of data structures.
Markup Language: Like HTML, it uses tags to annotate and structure the data.
The primary purpose of XML is to store and transport data in a way that is both human-readable and machine-readable.